The User Stories (seen just above) go into a Sprint Backlog, are estimated and prioritized and committed to the next Sprints.

Burndown Chart

According to the Wikipedia, “a burn down chart is a graphical representation of work left to do versus time. The outstanding work (or backlog) is often on the vertical axis, with time along the horizontal. (…) It is useful for predicting when all of the work will be completed”.

These charts show the progress during a Sprint, of the completion of tasks from a Sprint Backlog (seen just above).